Tektronix DSA8200 Primary User

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DSA8200 DigitalSerialAnalyzer

ZZZ

Quick Start User Manual

*P071204706*

071-2047-06

DSA8200 Digital Serial Analyzer

ZZZ

Quick Start User Manual

www.tektronix.com

071-2047-06

tional copyright laws and international treaty provisions.

Tektronix pro previously published material. Speciﬁcations and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

TEKPROBE and FrameScan are registered trademarks of Tektronix, Inc.

ducts are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all

Contacting Tektronix

Tektronix, Inc. 14200 SW Karl Braun Drive P.O. Box 500 Beaverton, OR 97077 USA

For product information, sales, service, and technical support:

In North America, call 1-800-833-9200. Worldwide, visit www.tektronix.com to ﬁnd contacts in your area.

Warranty

Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product. Parts, modules and replacement products used by Tektronix for warranty work may be new or reconditioned to like new performance. All replaced parts, modules and products become the property of Tektronix.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service. Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage resulting from a ttempts by personnel other than Tektronix representatives to install, repair or service the product; b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a product that has been modiﬁed or integrated with other products when the effect of such modiﬁcation or integration increases the time or difﬁculty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND E XCLU S IVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

[W2 – 15AUG04]

Table of Contents

General Safety Summary ...... . . . . . .... . . . . . . ... . . . . . . .... . . . . . .... . . . . . . ... . . . . . . .... . . . . . ..... . . . . . .... . . . . . . ... . . . . . . .... . . . . . .... iii

Compliance Information............................................................................................................... v

EMC Compliance................................................................................................................. v

Safety Compliance.............................................................................................................. vii

Environmental Considerations................................................................................................... ix

Preface................................................................................................................................. x

Documentation ...................................................................................................................x

Conventions Used in this Manual . . . . .... . . . . . . .... . . . . . . . ... . . . . . . .... . . . . . . ..... . . . . . . .... . . . . . . ... . . . . . . . .... . . . . . . .... . . . . . . xi

Key Features........................................................................................................................... 1

Install Your Instrument................................................................................................................. 3

Standard Accessories. . . .... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . ..... . . . . . . ... . . . . 3

Operating Considerations........................................................................................................ 4

Installing Modules . .... . . . . . .... . . . . . .... . . . . . .... . . . . . .... . . . . . . .... . . . . . .... . . . . . .... . . . . . .... . . . . . .... . . . . . .... . . . . . .... . . . . . .. 6

Powering the Instrument On and Off ............................................................................................ 7

Adding a Second Monitor........................................................................................................ 8

Changing the W indows Language . . .... . . . . . . .... . . . . . . .... . . . . . . . ... . . . . . . .... . . . . . . ..... . . . . . . .... . . . . . . ... . . . . . . . .... . . . . . . 10

Getting Acquainted with Your Instrument.. . . . . . . ... . . . . . . .... . . . . . . ... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . ... . . . . . . .... . . . . . 13

Front Panel .. . . . . . . . .... . . . . . . .... . . . . . . ..... . . . . . . .... . . . . . . .... . . . . . . . ... . . . . . . . ... . . . . . . . .... . . . . . . .... . . . . . . ..... . . . . . . .... . .13

Control Panel .. . . . . . . .... . . . . . . ..... . . . . . . ... . . . . . . .... . . . . . . ..... . . . . . . ... . . . . . . .... . . . . . . ..... . . . . . . ... . . . . . . .... . . . . . . .... . . . .14

Rear Panel .... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . 16

Computer I/O Panel . . . . . ..... . . . . . . ... . . . . . . .... . . . . . . ... . . . . . . ..... . . . . . .... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . ... . . . 17

Interface ......................................................................................................................... 17

Display - Single Graticule View................................................................................................. 19

Display - Multiple Views......................................................................................................... 20

Accessing Online Help.......................................................................................................... 20

Inspect Your Instrument .............................................................................................................. 23

Verify Internal Diagnostics Pass . . . . .... . . . . . .... . . . . . ... . . . . . . ... . . . . . . ... . . . . . . ... . . . . . . ... . . . . . .... . . . . . .... . . . . . ... . . . . . . ... 23

Optimizing Measurement Accuracy.................................................................................................. 25

Signal P a th Compensation . . . . . .... . . . . . .... . . . . . . ... . . . . . . .... . . . . . ..... . . . . . .... . . . . . . ... . . . . . . .... . . . . . .... . . . . . . ... . . . . . . .. 25

Perform Dark-Level and User Wavelength Ga

isition ............................................................................................................................ 30

Acqu

Setting Up Signal Input . . . . ... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . .... 30

Using Autoset ................................................................................................................... 32

Using Default Setup............................................................................................................. 32

Accessing theSetup Dialog Boxes............................................................................................. 33

Changing the Acquisition Mode . . . . ... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . .... . . . . . . ... . . . . . . .... . . . . . ..... . . . . . .... . . . 34

Setting the Display Style........................................................................................................ 35

Triggers . . . ... . . . . . ... . . . . . ... . . . . . .... . . . . ... . . . . . ... . . . . . . ... . . . . ... . . . . . . ... . . . . . ... . . . . . ... . . . . . ... . . . . . ... . . . . . .... . . . . ... ........ 37

Triggering Concepts. ... . . . . . . ... . . . . . . .... . . . . . .... . . . . . .... . . . . . .... . . . . . .... . . . . . .... . . . . . .... . . . . . . ... . . . . . . ... . . . . . . ... . . . . . 37

Setting Trigger Controls...... . . . . . . ... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . ... . . . 40

Setting Pattern Sync Controls .................................................................................................. 41

Checking Trigger Status . . . ..... . . . . . . ... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . .... . . . . . . .... . . . . . . .... . . . . . . ... 42

Table of Content

in Compensations. . . . .... . . . . . .... . . . . . . ... . . . . . . ... . . . . . . ... . . . . . . ... . . . . . . .. 27

DSA8200 Quick Start User Manual i

Table of Content

Analyzing Waveforms . . . . . ..... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . ..... . . . . . . ... . . . . . . .... . . . . . . .... . ... 43

Using the 8

Skew and Deskewing................................................................................................................. 72

Cleani

Restoring the Operating System.....................................................................................................86

Index

Taking Automat

Turning Off Automatic Measurements.......................................................................................... 47

Cursor Measurements .......................................................................................................... 48

Math Waveform

Waveform Databases . . .... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . . .... . . . . . . .... . . . . . . ... . . 52

Display a Communication Signal . . ... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . ... . . . 53

Display and A

FrameScan ...................................................................................................................... 57

To Use TDR ..................................................................................................................... 58

Phase Refer

Histograms ......................................................................................................................61

Document Your Results......................................................................................................... 63

0A05 Electrical Clock Recovery Module Examples . . . . .... . . . . . . ... . . . . . . .... . . . . . .... . . . . . . ... . . . . . . .... . . . . . ..... . . . 65

Clock Recovery / Trigger on Recovered Clock ..... . . . . . . ... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .. 66

Clock Recovery / Trigger for Optical Signal, with the 80C12 Optical Module . .... . . . . . .... . . . . . . .... . . . . . . ... . . . . . . ... . . . . . . 67

Differen

Probing with Low-Impedance Probes . . . . . . .... . . . . . . ... . . . . . . ..... . . . . . . ... . . . . . . .... . . . . . . ... . . . . . . . .... . . . . . . ... . . . . . . .... . . 69

Probing with Differential to Single-Ended Probes. . . . .... . . . . . ..... . . . . . .... . . . . . . ... . . . . . . .... . . . . . .... . . . . . . ... . . . . . . .... . . . . 70

Vertical

Methods toAdjust Skew ........................................................................................................ 72

Setup Co

Acquisition Deskew Procedure . . . . . . . ... . . . . . . ... . . . . . . .... . . . . . . ... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . ... . . . . . . .... . . 78

TDR Step Deskew P rocedure . . .... . . . . . . ... . . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . .... . . . . . . ... . . . . . . ..... . . . 81

ng the Instrument.............................................................................................................. 85

Exterior Cleaning... . . . . . . .... . . . . . .... . . . . . .... . . . . . . ... . . . . . . ... . . . . . . ... . . . . . . ... . . . . . . .... . . . . . .... . . . . . .... . . . . . . ... . . . . . . ..85

Flat Panel Display Cleaning .... . . . . . . .... . . . . . .... . . . . . . ... . . . . . . ..... . . . . . .... . . . . . . ... . . . . . . .... . . . . . . ... . . . . . . .... . . . . . . .... 85

al Connector Cleaning . . . . .... . . . . . . ... . . . . . . ..... . . . . . . .... . . . . . . ... . . . . . . ..... . . . . . . .... . . . . . . ... . . . . . . ..... . . . . . . ... . . . 85

Optic

Restoring theOperating System with Restore Discs .......................................................................... 87

ring the Operating System from the Instrument Hard Disk Drive (SN B020551 through B029999) ... . . . . . . .... . . . . . 87

Resto

Create Restore CD-ROMs (Serial Numbers B020551 to B029999) . . ... . . . . . . ..... . . . . . . ... . . . . . . .... . . . . . . ..... . . . . . . ... . . . 88

ic Measurements............................................................................................... 43

s ................................................................................................................ 50

nalyze Communication Signals Using Mask Testing........................................................... 54

ence................................................................................................................ 60

tial Clock Recovery and Acquisition ................................................................................... 68

Gain Adjustment........................................................................................................ 71

nsiderations and P rocedures . . . . .... . . . . . . ... . . . . . . .... . . . . . .... . . . . . . ... . . . . . . ..... . . . . . .... . . . . . . ... . . . . . . .... . . . . . 73

ii DSA8200 Quick Start User Manual

General Safety S

ummary

General Safet

Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it.

To avoid potential hazards, use this product only as speciﬁed.

Only qualiﬁed personnel should perform service procedures.

While using this product, you may need to access other parts of a larger system. Read the safety sections of the other component manuals for warnings and cautions related to operating the system.

To Avoid Fire or Personal Injury

Use Proper Power Cord. Use only the power cord speciﬁed for this product and certiﬁed for the country of use.

Connect and Disconnect Properly. Do not connect or d isconnect probes or test leads while they are c onnected

to a voltag

Ground th

shock, the grounding conductor must be connected to earth ground. Before making connections to the input or output terminals of the product, ensure that the product is properly grounded.

Observe All Terminal Ratings. To avoid ﬁre or shock hazard, observe all ratings and markings on the product. Consult

the prod

The inpu

e source.

e Product.

uct manual for further ratings information before making connections to the product.

ts are not rated for connection to mains or Category II, III, or IV circuits.

y Summary

This product is grounded through the grounding conductor of the power cord. To avoid electric

Do not ap

Power D

Do not block the power switch; it must remain accessible to the user at all times.

ply a potential to any terminal, including the common terminal, that exceeds the maximum rating of that terminal.

isconnect.

The power switch disconnects the product from the power source. See instructions for the location.

Do Not Operate Without Covers. Do not operate this product with covers or panels removed.

Do Not Operate With Suspected Failures. If you suspect that there is damage to this product, have it inspected by

qualiﬁed service personnel.

Avoid Exposed Circuitry. Do not touch exposed connections and components when power is present.

Use Proper Fuse. Use only the fuse type and rating speciﬁed for this product.

Wear Eye Protection. Wear eye protection if exposure to high-intensity rays or laser radiation exists.

Do Not Operate in Wet/Damp Conditions.

Do Not Operate in an Explosive Atmosphere.

Keep Product Surfaces Clean and Dry.

Provide Proper Ventilation.

oper ventilation.

Refer to the manual’s installation instructions for details on installing the product so it has

DSA8200 Quick Start User Manual iii

General Safety S

TermsinthisManual

These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result in injury or loss of l ife.

CAUTION. Caution statements identify c onditions or practices that could result in damage to this product or other property.

Symbols and Terms on the Product

These terms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you read the marking.

WARNING indicates an injury hazard not immediately accessible as you read the m arking.

CAUTION indicates a hazard to property including the product.

The following symbol(s) may appear on the product:

ummary

iv DSA8200 Quick Start User Manual

Compliance Info

rmation

Compliance In

This section lists the EMC (electromagnetic compliance), safety, and environmental standards with which the instrument complies.

EMC Compliance

EC Declaration of Conformity – EMC

Meets intent of Directive 2004/108/EC for E lectromagnetic Compatibility. Compliance was demonstrated to the following speciﬁcations as listed in the Ofﬁcial Journal of the European Communities:

EN 61326-1:2006, EN 61326-2-1:2006. EMC requirements for electrical equipment for measurement, control, and

laboratory use.

CISPR 11:2003. Radiated and conducted emissions, Group 1, Class A

IEC 61000-4-2:2001. Electrostatic discharge immunity

IEC 61000-4-3:2002. RF electromagnetic ﬁeld immunity

IEC 61000-4-4:2004. Electrical fast transient / burst immunity

IEC 61000-4-5:2001. Power line surge immunity

IEC 61000-4-6:2003. Conducted RF immunity

IEC 61000-4-11:2004. Voltage dips and interruptions immunity

1236

formation

EN 61000-3-2:2006. AC power line harmonic emissions

EN 61000-3-3:1995. Voltage changes, ﬂuctuations, and ﬂicker

European Contact.

Tektronix UK, Ltd. Western Peninsula Western Road Bracknell, RG12 1RF United Kingdom

This product is intended f or use in nonresidential areas only. Use in residential areas may cause electromagnetic interference.

Emissions which exceed the levels required by this standard may occur when this equipment is connected to a test object.

To ensure compliance with the EMC standards listed here, high quality shielded interface cables should be used.

Horizontal timing susceptibility of the optical sampling modules and their internal clock recovery trigger signals usually increases the horizontal timing jitter when external electromagnetic ﬁ elds are applied. For ﬁelds up to 3 V/m, the increase in the horizontal high-frequency RMS jitter is typically less than 3 ps RMS of jitter, added using the square-root-of-the-sum-of-the-squares method. An example follows:

If an 80C01–CR operating in clock-recovery trigger mode exhibits 3.5 ps RMS of edge jitter, with no EMC ﬁeld applied and for an ideal jitterless input, then for applied ﬁelds up to 3 V/m the edge jitter, degradation would typically result in a total RMS jitter of:

Performance Criterion C applied at the 70%/25 cycle Voltage-Dip and the 0%/250 cycle Voltage-Interruption test levels (IEC 61000-4-11). If the instrument powers down upon a voltage dip or interruption, it will take longer than ten seconds to reboot.

DSA8200 Quick Start User Manual v

Compliance Info

With an 80E01 Electrical Sampling module, up to 15 mV signals as deﬁned in the IEC 61000-4-3 and IEC 61000-4-6 tests.

Australia / New Zealand Declaration of Conformity – E MC

rmation

random noise is allowed when the instrument is subjected to ﬁelds and

RMS

Complies with

CISPR 11:200 EN 61326-2-1:2006.

the EMC provision of the Radiocommunications Act per the following standard, in accordance with ACMA:

3. Radiated and Conducted Emissions, Group 1, Class A, in accordance with EN 61326-1:2006 and

vi DSA8200 Q uick Start User Manual

Safety Compliance

EC Declaration of Conformity – Low Voltage

Compliance was demonstrated to the following speciﬁcation as listed in the Ofﬁcial Journal of the European Communities:

Low Voltage Directive 2006/95/EC.

EN 61010-1: 2001. Safety requirements for electrical equipment for m easurem ent control and laboratory use.

Compliance Info

rmation

U.S. Nation

UL 3111-1, First Edition, 2ndAmendment. Standard for electrical measuring and test equipment.

ally Recognized Testing Laboratory Listing

Canadian Certiﬁcation

CAN/CSAlaboratory use. Part 1.

C22.2 No. 61010.1–97. Safety requirements for electrical equipment for measurement, control, and

Additional Compliances

IEC 61010-1: 2001. Safety requirements for electrical equipment for measurement, control, and laboratory use.

Equipment Type

Test and measuring equipment.

y Class

Safet

Class 1 – grounded product.

Pollution Degree Description

asure of the contaminants that could occur in the environ ment around and within a p roduct. Typically the internal

Ame environment inside a product is considered to be the same as the external. Products should be used only in the environment for which they are rated.

Pollution Degree 1. No pollution or only dry, nonconductive pollution occurs. Products in this category are generally

capsulated, hermetically sealed, or located in clean rooms.

llution Degree 2. Normally only dry, nonconductive pollution occurs. Occasionally a temporary conductivity that is

Po caused by condensation must be expected. This location is a typical ofﬁce/home environment. Temporary condensation occurs only when the product is out of service.

Pollution Degree 3. Conductive pollution, or dry, nonconductive pollution that becomes conductive due to condensation.

hese are sheltered locations where neither temperature nor humidity is controlled. The area is protected from direct

T sunshine, rain, or direct wind.

Pollution Degree 4. Pollution that generates persistent conductivity through conductive dust, rain, or snow. Typical outdoor locations.

DSA8200 Quick Start User Manual vii

Compliance Info

Pollution Degree

Pollution Degree 2 (as deﬁned in IEC 61010-1). Note: Rated for indoor use only.

Installation (Overvoltage) Category Descriptions

Terminals on this product may have different installation (overvoltage) category designations. The installation categories are:

Measurement Category IV. For measurements performed at the source of low-voltage installation.

Measurement Category III. For measurements performed in the building installation.

Measurement Category II. For measurements performed on circuits directly connected to the low-voltage installation.

Measurement Category I. For measurements performed on circuits not directly connected to MAINS.

rmation

Overvolta

Overvoltage Category II (as deﬁned in IEC 61010-1)

ge Category

viii DSA8200 Quick Start User Manual

Environmental Considerations

This section provides information about the environmental impact of the product.

Product End-of-Life Handling

Observe the following guidelines when recycling an instrument or component:

Equipment Recycling. Production of this equipment required the extraction and use of natural resources. The

equipment may contain substances that could be harmful to the environment or human health if improperly handled at the product’s end of life. In order to avoid release of such substances into the environment and to reduce the use of natural resources, we encourage you to recycle this product in an appropriate system that will ensure that most of the m aterials are reused or recycled appropriately.

This symbol indicates that this product complies with the applicable European Union requirements according to Directives 2002/96/EC and 2006/66/EC on waste electrical and electronic equipment (WEEE) and batteries. For information about recycling options, check the Support/Service section of the Tektronix Web site (www.tektronix.com).

Compliance Info

rmation

Mercury N

to environmental considerations. Please contact your local authorities or, within the United States, refer to the E-cyc ling Central Web page (www.eiae.org) for disposal or recycling information.

otiﬁcation.

This product uses an LCD backlight lamp that contains mercury. Disposal may be regulated due

Perchlorate Materials. This product contains one or more type CR lithium batteries. According to the state

of California, CR lithium batteries are classiﬁed as perchlorate materials and require special handling. See www.dtsc.ca.gov/hazardouswaste/perchlorate for additional information.

Restriction of Hazardous Substances

roduct has been classiﬁed as Monitoring and Control equipment, and is outside the scope of the 2002/95/EC RoHS

This p Directive.

DSA8200 Quick Start User Manual ix

Preface

Documentation

This manual describes the installation and operation of the DSA8200 Digital Serial Analyzer along with basic operation and concepts. For more detailed information, see the online help on your instrument.

NOTE. The screen images in this manual may differ slightly from other versions of product software.

Additional information is available through a variety of sources. The following table points to the location of different types of information available for this product.

Type of information Location

Unpacking, installation, operation and overviews

In-depth operation, UI help, programming help Instrument online help

Performance veriﬁcation and speciﬁcations Product documentation CD

Product software Product software CD

Self service Service manual

PDF ﬁles of instrument and modules manuals Product software CD

Quick Start User Manual

www.tektronix.com/software

www.tektronix.com/manuals

x DSA8200 Quick Start User Manual

Conventions Used in this Manual

The following icons are used throughout this manual.

Preface

Rear panel power

Front panel power

Connect power

Network

PS2 SVGA USB

DSA8200 Quick Start User Manual xi

Preface

xii DSA8200 Quick Start User Manual

Key Features

The DSA8200 Digital Serial Analyzer is a high-speed, precision sampling system that ﬁnds use in validation and conformance testing and impedance veriﬁcation for:

High-performance semiconductor/computer applications, such as semiconductor testing, TDR characterization of circuit boards, IC packages and cables, and high-speed serial digital data communications.

High-performance communications applications, s uch as design evaluation and manufacturing test of datacom and telecom components, transceiver subassemblies, and transmission systems.

The instrument includes a user interface that runs on the Microsoft Windows XP Professional operating system as a windowed application. You operate the instrument using front-panel controls with the mouse and keyboard or with the touch screen.

Features Include:

Industry-leading waveform acquisition and measurement rate, with Sample, Envelope, and Average acquisition modes.

Support for up to six sampling modules (two large and four small modules). Up to eight inputs can be active at a time.

Support for integrated optical and/or electrical signal pick-off and clock recovery, enabling a ccurate triggering on optical and/or electrical c ommunication signals.

Support for optical modules with several integrated, selectable reference receivers, which eliminates the need for a multitude of add-on reference receivers.

Key Features

Full programmability, with an extensive GPI B-command set and a message-based interface.

True differential TDR, with fast step (15 psec reﬂected risetime) when used with a TDR-capable 80E10 sampling module.

Industry-leading trigger bandwidth (12+ GHz) when using the built-in prescaler.

Support of both telecom (SONET and SDH) and datacom (Fibre Channel, Inﬁniband, and Gigabit Ethernet) optical communication standards.

Powerful built-in measurement capability, including histograms, mask testing, and automatic measurements.

Automatic measurements operate on Pulses, RZ eye patterns, and NRZ eye pa

DC to 65 GHz optical bandwidth; DC to 70+ GHz electrical bandwidth, with up to 12.5 GHz triggering. Bandwidth is determined by the capabilities of the installed modules.

Low jitter (200 fs typical) in phase reference modes with the 82A04 Phase Reference module.

FrameScan acquisition for isolating data-dependent failures during conformance/performance testing and for examining very low-level repetitive signals.

Pattern (frame) triggering with the 80A06 PatternSync Trigger module.

Jitter, Noise, and BER analysis with the 80SJNB Essentials application. With the 80SJNB Advanced application, features for de-embedding of the ﬁxture, channel emulation, and FFE/DFE equalizer support are also added.

Improved acquisition throughput and timing accuracy using the PatternSync Trigger module in conjunction with FrameScan.

Support for optical conformance testing of SONET/SDH signals (including the various forward error correction rates for these telecom rates) from 155 Mbps to 43 Gb/s, Fibre Channel signals, and 1, 2, 10, and 100 Gigabit Ethernet signals as well as 2.5 Gb/s Inﬁniband signals. Support for conformance testing rates is determined by the speciﬁc modules that are installed.

tterns.

High precision time base with two modes of operation, locked and short-term jitter-optimized.

DSA8200 Quick Start User Manual 1

Key Features

Negligible long-term jitter degradation (<0.1 ppm), which substantially improves the ability to view signals that are delayed far fro

m the trigger point without distortion.

Improved shor

A gated trigge connect to the instrument rear panel. This option allows you to use recirculating buffers as part of your test setup to simulate the effects of very long optical links that are typical of undersea cables and long terrestrial links.

Analysis and connectivity tools that enable the instrument to be controlled from a variety of local and remote environment

Predeﬁned,

A large 10-i

An intuitiv

t-term and long-term trigger jitter.

r option (Option GT) that lets you disable or enable (gate) triggering based on a TTL signal that you

s and to share data with other commercially available analysis programs.

built-in masks in addition to the user-deﬁned masks.

nch color display that supports color grading of waveform data to show sample density.

e user interface (UI), with built-in online help.

2 DSA8200 Quick Start User Manual

Install Your Instrument

Unpack the instrument and check that you received all items listed as Standard Accessories. Recommended accessories and probes, instrument options, and upgrades are listed in the online help. Check the Tektronix Web site (www.tektronix.com) for the most current information.

Standard Accessories

Accessory Tektronix part number

DSA8200 Digital Serial Analyzer Quick Start User Manual

Certiﬁcate of Traceable Calibration for product at initial shipment

Business reply card Not orderable

Microsoft Windows compatible keyboard

Microsoft Windows compatible mouse

Instrument front cover

Accessory pouch 016-1441-00

Touch screen styluses (2)

ESD wrist strap with 6 foot coiled cord

DSA8200 Product Documentation Kit (CD)

DSA8200 Online Help (part of application software)

DSA8200 Programmer Online Guide (part of application software)

DSA8200 Product Software Kit

DSA8200 Operating System Restore Kit

Serial numbers B030000 and above

8000 Demo Applications Software CD

Power cord Type dependent on selection

Install Your Ins

071-2047-xx

Not orderable

119-B146-00

119-6936-00

200-4519-00

119-6107-00

006-3415-04

020-2543-xx

Not orderable

020-2734-xx

020-2980-xx

020-2480-xx

during order placement

trument

DSA8200 Quick Start User Manual 3

Install Your Ins

trument

Operating Considerations

The following information lists the speciﬁcations related to the operation of the mainframe. Refer to the DSA8200 Speciﬁcations and Performance Veriﬁcation manual for a complete list of speciﬁcations.

Mechanical

Clearance:

Top, Front, and Rear: 0 in (0 mm)

Sides: 2 in (51 mm)

Bottom: 0.75 in (19 mm)

Weight:

19.5 kg (43.0 lb.). This does not include

any accessories or modules.

Environmental

Temperature

Relative humidity

Altitude

10 °C to +40 °C

20% to 80%, with a maximum wet bulb temperature of 29 °C at or below +40 °C

3,000 m (9,843 ft.)

Power Supply

Source voltage and Frequency 100 - 240 V

Power Consumption

600 watts

Typically, 240 watts (fully loaded); 160 watts (mainframe with no modules)

Input Connectors

Trigger Direct Input range

±1.5 V (DC + peak AC) maximum input voltage

±10%, 50 - 60 Hz or 115 V

RMS

±10%, 400 Hz

RMS

4 DSA8200 Quick Start User Manual

Install Your Ins

trument

Trigger Presca

led Input absolute maximum

±2.5 V

input (typical)

External 10 MHz Reference Input 500 mV

Gated Trigger Input non-destruct levels

±5 V maximum

(Option GT equipped mainframes)

p-p

to5V

AC coupled into 1 kΩ , ±5 V maximum

p-p

DSA8200 Quick Start User Manual 5

Install Your Ins

trument

Installing Modules

CAUTION. To prevent damage to modules, do not transport or ship the instrument with modules installed. Modules are

also sensitiv removing modules and when connecting signals to the module inputs. Never install or remove modules while the instrument is powered on.

1. Always use an ESD wrist strap (provided) when installing and removing modules.

2. You can install up to two large sampling modules and total of 8 inputs.

Following are some typical module installations illustrating the interaction between large compartment channels and small compartment channels.

e to electrostatic discharge (ESD). To avoid ESD dam age, always use an ESD wrist strap when installing or

four small modules for a

NOTE. A large compartment module that only derives power from the compartment does not use any small compartment

input channels.

Eight channels: No large and four small modules

Six channels: Two large modules and two small modules

Seven channels: One large module, installed in CH3 compartment, and three small modules

Seven channels: One large module, installed in CH1 compartment, and three small modules

6 DSA8200 Quick Start User Manual

Powering the Instrument On and Off

Install Your Ins

trument

1. Insert AC powe

2. To g g l e t h e m a i

3. Use the fron

switch the instrument on and off.

r cord.

ns switch to on.

t panel power button to

Quick Tip

When turning off the instrument, Microsoft Windows and all applications automatically shut down before the instrument powers off.

ON. To prevent damaging the modules, do not install or remove any modules while the instrument is powered on.

CAUTI

DSA8200 Quick Start User Manual 7

Install Your Ins

trument

Adding a Second Monitor

You can operate the instrument while using Microsoft W indows and installed applications on an external monitor. Use the Settings tab in the Windows Display Properties dialog box to set up a dual-monitor conﬁguration. Both the oscilloscope and the second monitor must have the color setting set to True Color.

1. Power off the instrument.

2. Connect a video cable (not supplied)

from the SVGA out dual monitor display video port on the back of the instrument to the external monitor.

3. Power on the instrument.

4. Power on the external monitor.

8 DSA8200 Quick Start User Manual

5. In the Start menu, select Control Panel.

6. Select Display.

Install Your Ins

trument

DSA8200 Quick Start User Manual 9

Install Your Ins

trument

7. In the Display P the Settings tab.

8. Click the grayed out external monitor (2) and drag it to the left of monitor 1.

9. Select Yes when you are prompted to enable the ne

10. Click OK and A prompted to restart your system so the changes can take effect.

roperties window, select

w monitor.

pply. You will then be

Changing the Windows Language

Use the f change the language in the TekScope application. Before you begin, minimize the TekScope application.

1. In the Start menu, select Control Panel.

2. Select Regional and Language

ollowing procedure to change the Windows language from English to one of your choice. This procedure does not

Option

10 DSA8200 Quick Start User Manual

3. Select your location.

4. Select your language preference. The

time and numbering system of your selected loca

le will adjust automatically

to this selection.

5. Select the Languages tab to further

specify your preferences. For more details on cu

stomizing your language

options, see your Windows XP help.

Install Your Ins

trument

DSA8200 Quick Start User Manual 11

Install Your Ins

trument

12 DSA8200 Quick Start User Manual

Getting Acquain

tedwithYourInstrument

Getting Acqua

Front Panel

The front panel of your instrument gives you access to the module compartments and the control panel.

inted with Your Instrument

1. Antistatic connection 1 MΩ terminal.

2. On/Off switch.

3. Trigger prescale input.

4. Trigger direct input.

5. Trigger probe power.

6. External 10 MHz reference input.

7. DC calibration output.

8. Internal clock output.

9. USB port.

10. Control panel.

11. CDRW/DVD drive.

DSA8200 Quick Start User Manual 13

Getting Acquain

ted with Your Instrument

Control Panel

1. Access print dialog box for printing the display.

2. Optimize instrument settings for selected channels.

3. Quickly return to instrument-default control settings.

4. Display m easurement cursors and assign the knob and SELECT buttons to control them.

5. Menu buttons quickly access the setup dialog box for more detailed setup.

6. Clear all channel waveforms at once.

7. Adjust most c ontrol ﬁelds in setup dialogs. Press the SELECT button to switch among ﬁelds. Press the FINE button to

toggle between normal and ﬁne adjustment.

8. Start and stop acquisition.

9. Display the cluster of Setup dialog boxes for comprehensive setup of the instrument.

10. Toggle the touch screen on and off. Use the touch screen to control UI when you have not installed a mouse.

11. Select a waveform type, Channel, Reference, or Math, to display or adjust on screen (selected button lights).

12. Select among displayed waveforms or display and select a waveform. Press selected w aveform to turn it off. Button

lights indicate displayed and selected waveforms.

14 DSA8200 Quick Start User Manual

Getting Acquain

tedwithYourInstrument

13. S e lect among displayed timebase views or display and select a timebase view. Press selected view to turn it off (except

main, which is a

lways on).

14. Vertically sc

15. Horizontally

16. S et trigger le

ale, position, and offset selected waveform.

scale, position, and set record length of selected waveform.

vel and use lights to monitor trigger state.

DSA8200 Quick Start User Manual 15

Getting Acquain

ted with Your Instrument

Rear Panel

The rear panel of your instrument allows you access to input and output connectors and the AC input.

1. Removable hard drive.

2. Scope VGA output for instrument display.

3. Computer I/O panel.

4. GPIB port. The instrument is factory set to be a GPIB device (slave), allowing you to control the instrument via the GPIB

port. You can change the instrument to be a G PIB controller (master), allowing you to control other devices via the GPIB port. Refer to the online Programmer Guide installed on the instrument.

5. Gated trigger Option GT.

6. AC input.

7. Fuses.

8. Mains power switch.

16 DSA8200 Quick Start User Manual

Computer I/O Panel

1. Audio line in.

Getting Acquain

tedwithYourInstrument

2. Audio line o ut.

3. Audio line in (microphone).

4. Side surround sound.

5. Rear surround sound.

6. Center Bass surround sound.

7. SVGA out for dual-monitor display.

8. COM 1.

9. PS2 (keyboard).

10. PS2 (mouse).

11. Parallel port.

12. USB ports.

13. LAN.

Interface

The menu bar provides access to commands that control all of the instrument features and functions. The toolbar provides access to the most common features.

Hovering the cursor over a button or setting displays a brief description of its function, called a tooltip.

DSA8200 Quick Start User Manual 17

Getting Acquain

ted with Your Instrument

1. Tool Bar. Access to key features: printing, setup dialogs, math setup, waveform database, autoset, clear data, acquisition mode, triggering, and applications.

2. Menu Bar. Access to data I/O, printing online help system, and setup functions.

3. Status Bar. Trigger status and waveform count.

4. Readout Bar. Toggle individual readout on and off by clicking its button.

5. Phase R eference Status. Indicates the characterization status of the phase reference module.

6. A Readout. Right click any readout to display a short-cut menu providing access to often-used setup controls and

properties for the features associated with the readout.

7. Readouts. Display up to ﬁve readouts in this area; select readouts from the Readout Bar.

8. Compensation Indicator. Indicates the compensation status of modules and mainframe.

9. Controls Bar. Quick access to waveforms and timebases for display, and to their scale, offset, and position controls for

adjustment.

10. Waveform Bar. Access to waveform selection (click), waveform position (drag), and waveform properties (right-click).

11. Display. Live, reference, and math waveforms display here, along with cursors and masks to analyze them.

12. Measurements Bar. Access to automated measurements by signal type and category; click measurement buttons to

measure the selected waveform.

18 DSA8200 Quick Start User Manual

Display - Single Graticule View

Getting Acquain

tedwithYourInstrument

1. Drag the Horizontal Reference to move the point around which the horizontal scaling expands and contracts the

waveforms.

2. Drag cursors to measure waveforms on screen.

3. Drag the waveform icon vertically to position waveform.

4. Right-click on a waveform or its icon for access to often used setup controls and properties.

5. Drag ground reference icon to add offset to a waveform.

6. Drag across the waveform area to zoom the boxed waveform segment to full screen width.

DSA8200 Quick Start User Manual 19

Getting Acquain

ted with Your Instrument

Display - Multiple Views

1. Drag the m

2. Drag the

3. Drag the

4. Mag2 Vie

5. Mag1 Vi

6. MAIN Vi

arkers to enclose the portion of waveform to appear in Mag1 View.

markers to enclose the portion of waveform to appear in Mag2 View.

border between graticules to vertically size Main, Mag1, and Mag2 Views.

ew.

Accessing Online Help

In-depth information about all the features of your instrument is available in the online help.

For a brief description of controls, move your mouse pointer and let it rest over a control, such as a menu name, a menu item, tool-bar button, or tool-bar readout. The help system displays a short deﬁnition or a label (tooltips) of the control.

20 DSA8200 Quick Start User Manual

Getting Acquain

tedwithYourInstrument

For a more detai

led description, click the What’s This? button in the main display or in a dialog box.

After clicking the What’s This? button, click the control you want described. A popup box describes the control.

DSA8200 Quick Start User Manual 21

Getting Acquain

ted with Your Instrument

For in-depth, c

ontextual overviews, most dialog boxes have a Help button. Click the button to open the help system with an overview of th

e dialog box that is currently

displayed.

You can search for in-depth help from the application menu bar: select Help and then

HELP Contents & Index.

select

22 DSA8200 Quick Start User Manual

Inspect Your Instrument

Use the following procedure to verify the functionality of your instrument. For a complete performance veriﬁcation, see the Performance Veriﬁcation section in the optional service manual.

Verify Internal Diagnostics Pass

1. Install all modules to be diagnosed.

2. Power on the instrument and wait

20 minutes for the warm-up period.

Inspect Your Ins

trument

3. From the Utilities menu, select

Diagnostics....

DSA8200 Quick Start User Manual 23

Inspect Your Ins

4. Select the Subsystem Level tab.

5. Select all the entries by clicking the ﬁrst

entry Control Proc and dragging down to select the r highlighted.

6. In the Run box, leave Loop and Halt on Failure unchecked.

7. Click Run.

8. Verify that Pass appears as Status in

the dialog b complete. If diagnostic failures occur, contact your local Tektronix service personnel

trument

est. All entries should be

ox when the diagnostics

24 DSA8200 Quick Start User Manual

Optimizing Meas

urement Accuracy

Optimizing Me

This instrument can compensate itself and the installed sampling m odules, optimizing the internal signal path used to acquire the waveforms you measure. Compensation optimizes the capability of the instrument to make accurate measurements at the ambient temperature.

NOTE. When installing a module or moving a module to another compartment, you must power on the instrument and

allow the temperature (of the instrument and module(s)) to reach a stable equilibrium (normally 20 minutes). Then, run Compensation from the Utilities menu. This ensures the instrument meets the published speciﬁcations.

You must save the compensation results or they will be lost when the instrument is powered down.

asurement Accuracy

Signal Path Compensation

This procedure compensates the signal path of each installed module (for the current temperature) to enhance measurement results.

Use this p

When making measurements at v ertical scale settings less than or equal to 5 mV/div, perform the signal path compensation once a week. Failure to do so may result in the instrument not meeting warranted performance levels at those volts/div settin

rocedure for any of the following conditions:

A module h has been moved to another compartment.

The temperature has changed more than 5 °C since the last signal path compensation.

gs.

as been added to the instrument, an extender cable has been added or removed from a module, or a module

1. Instal

2. Instal

3. Power

l all modules to be compensated.

l all terminations and dustcovers.

Failure to ins tal l the 50 Ω terminations on electrical inputs can yield erroneous

nsation failures or results.

compe

on the instrument and wait

20 minutes for the warm-up period.

DSA8200 Quick Start User Manual 25

Optimizing Meas

4. Select Compensation...

5. In the Compensation dialog box, note

that the main instrument (mainframe) and sampli temperature change from the last compensation is also listed.

6. Wait until the Status for all items you want to co Up to Pass, Fail,orComp Req’d.

urement Accuracy

ng modules are listed. The

mpensate changes from Warm

7. Under Select Action, select Compensate and Save (default).

8. From the top dropdown list, choose All

t selection) to select the main

(defaul instrument and all its modules as targets to compensate.

9. Click the Execute button.

the instructions to disconnect

Follow inputs and install terminations that appear on screen; be sure to follow static

utions (see the user information for

preca your sampling module) when following these instructions.

10. Verify that the compensation routines

pass

If the status is Fail, rerun the compensation. If Fail status continues

ou have allowed warmup to occur,

and y the module or main instrument may need service.

11. Use the Compensation Indicator Button

isplay or hide the indicator on

to d the main display. Green indicates all modules have been successfully

pensated. Red indicates one or

com more modules require compensation.

26 DSA8200 Quick Start User Manual

Optimizing Meas

Perform Dark-Level and User Wavelength Gain Compensations

Performing a dark-level compensation maximizes the accuracy of the extinction ratio and other optical automatic measurements you take. Performing a User Wavelength Gain compensation optimizes an optical channel for your custom input signal.

NOTE. Dark-level compensation performs a subset of the module compensation process. It is designed to be fast so it can

be performed frequently, just before measurements are taken. This compensation is not saved and is only valid for the selected bandwidth or ﬁlter path and the internal optical power meter.

You should perform the procedure Signal Path Compensation to compensate all vertical bandwidth and ﬁlter selections. (See page 25, Signal Path Compensation.)

Use the following procedure to perform either compensation; this procedure applies only to optical modules.

1. Install at least one optical sampling

module in the instrument to be dark-level calibrated. Set the acquisition system to run continuously.

urement Accuracy

2. Use the

channel to be compensated.

Vertical buttons to select the

DSA8200 Quick Start User Manual 27

Optimizing Meas

urement Accuracy

3. From the applic Setup, and then click Vertical.

To run the Dark-Level compensation:

4. In Vert Setup dialog box, click the Dark Level button under Compensation.

Follow the instructions on screen.

Repeat steps 2 and 4 for any additional optical channels you want to compensate.

To run the User Wavelength Gain compensation (for custom input signals):

ation menu bar, click

5. Attach an optical signal, with a precisely known amount of optical power, to the optical module input.

Use an independently-calibrated average optical power meter to measure this power precisely. Then connect the signal to the optical module using the same ﬁber cables.

28 DSA8200 Quick Start User Manual

6. In Vert Setup dialog box, click the

User Wavelength Gain button under

Compensate. F

ollow the instructions on

the screen.

7. In the User Wavelength Gain

Compensation dialog box, s et the wavelength a

nd power of the signal to be

applied to the channel.

8. Press the OK button to exec ute the

compensation.

Optimizing Meas

urement Accuracy

DSA8200 Quick Start User Manual 29

Acquisition

This section contains concepts of and procedures for using the acquisition system. Detailed information is available in the online help.

Setting Up Signal Input

Use front-pa

CAUTION. Sampling modules are inherently vulnerable to static damage. Always observe static-safe procedures and

cautions as outlined in your sampling-module user manual.

1. Connect to the signal to be acquired using proper probi techniques. See the user manual for the sampling module you have chosen.

2. Connect an appropriate trigger signal to the instrument. (

3. Push the CH button (turns amber) to assign the waveform buttons (1–8)to operate on channel waveforms, then select the proper waveform button.

A waveform button lights when its channel is on; when on but not selected, its button is lighted green; when on and selected, its button is lighted amber.

Pushing the MATH button assigns the waveform buttons to math waveforms. If no math waveforms are deﬁned, the Deﬁne Math dialog box appears.

Push the REF buttontoassign the waveform buttons to reference waveforms. If no reference waveforms are deﬁned, the Recall Waveform dialog box appears.

nel buttons to set up your instrument to acquire the signal.

ng/connecting

See page 37, Triggers.)

30 DSA8200 Quick Start User Manual

4. Use the Vertical Offset knob to adjust

the selected waveform on the screen. Use the Vertic knobs to adjust the display.

al Scale and Position

Acquisition

5. Push the

sure that the main time base view is selected. Use horizontal knobs to scale and pos and to set sample resolution.

View Main button to make

ition the waveform on the screen

Quick Tips

You can click a waveform trace or its reference indicator with the mouse pointer (or touch screen) to select it.

Push AUTOSET to quickly set up instrument parameters based on the input signal.

Press Set to 50% in the Trigger controls, if required, to stabilize the display when using the Trigger Direct Input connector.

DSA8200 Quick Start User Manual 31

Acquisition

Using Autoset

Use Autoset to quickly and automatically set up the instrument (vertical, horizontal, and trigger parameters) based on the characteristics of the input signal.

1. Push the AUTOSET button to execute an Autoset.

If you use Autoset when one or more channels are displayed, the instrument uses the selected channel for horizontal scaling. Vertically, all channels in use are individually scaled.

Quick Tip

Use the Deﬁ

ne Autoset in the Utilities menu to display and change the Autoset properties.

Using Default Setup

1. To quickly return to the factory default

s, push DEFAULT SETUP.

setting

2. Click Y

es to restore the settings.

32 DSA8200 Quick Start User Manual

Accessing the Setup Dialog B oxes

Acquisition

1. You c an access

by using the front panel buttons, the ﬁle menu, or the toolbar.

the Setup dialog boxes

2. Click on the tabs to select among the

setup dialog boxes.

DSA8200 Quick Start User Manual 33

Acquisition

Changing the Acquisition Mode

Use the procedure that follows to set the data-acquisition mode and specify acquisition start and stop methods.

1. Press the Acquisition MENU button to display the Acq Setup dialog box.

2. Select the a

3. For Average

samples to average.

4. Set the Stop After mode and action by selecting one of the following options:

Run/Stop Button Only

Condition

5. If you selected Condition, choose a

conditio list. If the condition requires a count, enter a count.

6. Select a Stop Action action from the drop following actions:

None

Print Screen to File

Print Screen to Printer

Save all Waveforms

Enter a ﬁlename if you selected Print to File o

cquisition mode.

mode, enter the number of

n to stop on from the drop-down

-down list. Choose from the

r Save all Waveforms.

7. Sele

34 DSA8200 Quick Start User Manual

ct Ring B e ll if you want an audio

notice when the acquisition stops.

8. Press RUN/STOP to start the acquisition.

9. Press RUN/STOP again to stop the

acquisition.

Quick Tips

Run/Stop is available on both the front panel and the touch screen.

If Stop After is set to Condition, pressing RUN/STOP causes only one acquisition to run if the original condition has been met. You need to press CLEAR DATA so that the condition must be met again.

Setting the Display Style

1. Select Disp to start setting the display

styles.

2. Choose a display style.

Normal selects a display with no

acquisition data persistence.

Waveforms are displayed with the new data from ongoing acquisitions replacing data acquired from previous acquisitions.

Show Vectors turns on display lines between waveform dots; deselect to display only dots.

Select an Interpolation mode from the pulldown list.

Acquisition

Sin(x)/x interpolation computes record points using a curve ﬁt between the acquired samples.

Linear interpolation computes record points between actual acquired samples by using a straight line ﬁt.

Variable Persistence makes data persist for a speciﬁed time. New waveform displays accumulate data as new waveform records acquire, but with continuous replacement of the oldest data.

Set a time at which the oldest data is removed.

DSA8200 Quick Start User Manual 35

Acquisition

Inﬁnite Persistence makes data persist until you change some control or explicitly

clear the data. Waveform displays accumulate data as the instrument acquires new data, resulting in a buildup o

f data in all time slots.

3. Use the Grat

icule settings to select the graticule style and the graticule color and screen background.

36 DSA8200 Quick Start User Manual

Triggers

This section contains concepts and procedures for using the trigger system. Detailed information is available in the online help.

Triggering Concepts

Trigger Event

When a trigger event occurs, the instrument acquires a sample in the process of building a waveform record. The trigger event establishes the time-zero point in the waveform record and all samples are measured with respect to that event. The trigger event starts waveform acquisition. A trigger event occurs when the trigger source (the signal that the trigger circuit monitors) passes through a speciﬁed voltage level in a speciﬁed direction (the trigger slope). When a trigger event occurs, the instrument acquires one sample of the input signal. When the next trigger event occurs, the instrument acquires the next sample. This process continues until the entire record is ﬁlled with acquired samples. Without a trigger, the instrument does not acquire any samples. This behavior differs from that of real-time a cquisition systems, which can acquire a complete waveform record from a single trigger event.

Trigger Type

Triggers

This instrument supports edge triggering only, in which edge triggers gate a series of acquisitions. The slope control determines whether the instrument recognizes the trigger point on the rising or the falling edge of a s ignal. You can set the trigger slope from the toolbar at the top of the display or in the Trigger Setup dialog box. The level c ontrol determines where on that edge the trigger point occurs. You can set the trigger level from the front panel with the Trigger LEVEL knob. The slope and level controls apply only when the trigger source is set to External Direct (using the TRIGGER DIRECT INPUT connector).

Trigger Modes

The trigger modes control the behavior of the instrument when not triggered:

Normal mode sets the instrument to acquire a waveform only when triggered. Normal mode does not acquire data if triggering stops; the last waveform records acquired remains "frozen" on the display (if the channels containing them are displayed). If no last w avefo

Auto mode sets the instrument to acquire a waveform even if a trigger event does not occur. Auto m ode uses a timer tha starts after trigger rearm. If the trigger circuit does not detect a trigger before this timeout (about 100 ms), it auto triggers, forcing enough trigger events to acquire all active channels. In the case of repetitive acquisitions in automatic trigger mode, waveform samples are acquired, but at different places in the data stream (synchronization is lost). If you do signal to any displayed channel, a baseline is displayed for that channel.

rm exists, none is displayed.

not apply a

Trigger Sources

The trigger source provides the signal that the trigger system monitors. The source can be:

The internal clock of the instrument (TDR clock rate), with user-selectable clock frequencies. The INTERNAL CLOCK OUTPUT connector supplies a replica of the internal clock at the instrument front panel.

An external signal coupled to one of the trigger input connectors on the front panel.

External Direct, DC coupled, and usable with signals up to at least 3.0 GHz

DSA8200 Quick Start User Manual 37

Triggers

External Prescale, divided by 16, and usable with signals from 2.0 GHz up to at least 12.5 GHz

An internal clock-recovery trigger provided by either an optical sampling module that is equipped with a clock-recovery option or a ded depend on the sampling module used; for example, either 622 Mbps (OC-12/STM-4 standards) or 2.488 G bps (OC-48/STM-16 standards) for the 80C01-CR Optical Sampling Module.

A pattern (frame) trigger provided by a PatternSync trigger module such as the 80A06 PatternSync Trigger Module. The output of the on the front panel.

Use a trigger source that is synchronized with the signal you are sampling and displaying. Selection of your trigger source depends on your application, as shown in the following table.

icated electrical clock recovery module. Clock recovery is user-selectable for triggering rates that

pattern sync trigger module must be connected to the EXTERNAL DIRE CT TRIGGER INPUT connector

Table 1: Application-based triggering

Application

Communications (optical) serial NRZ data signals

TDR measurement using an electrical sampling module equipped with TDR

Measurements on systems with a synchronized pretrigger signal

Any application requiring that the input signal provide the trigger

Any application requiring that you probe the trigger source

Any application requiring that you perform special measurements using gated trigger

Source to use

Set source to Clock Recovery, set the clock-recovery type, and use an optical sampling module equipped with a clock-recovery option supporting the speciﬁc data rate of the serial optical signal.

The available clock recovery rates depend on which sampling module is installed.

Set source to Internal Clock to use the internal clock of the instrument (TDR clock), and select the appropriate clock frequency. Disconnect any signal connected to the External 10 MHz Reference Input when using the Internal clock.

Set source to External Direct or External Prescaler as appropriate and connect the pretrigger signal.

Set source to External Direct or External Prescaler as appropriate. Use a signal splitter or power divider to couple to both the Ext Direct or Prescaler input and the input channel, so that the sampled signal is also the trigger signal.

Set source to External Direct and use a Tektronix probe.

Set source to External Direct, select Gated Trigger, and use a TTL connection to trigger gate.

Trigger Source Connectors

External triggers can be connected to either the TRIGGER DIRECT INPUT or TRIGGER PRESCALE INPUT connectors on the front panel:

Signals connected to the PRESCALE connector are divided by eight and then fed to the trigger circuits.

Signals connected to the DIRECT connector are fed directly to the trigger circuitry. The signal is DC coupled and can be up to 3.0 GHz.

When using a given trigger source, disconnect any other trigger source from the front panel to ensure speciﬁed performance. Speciﬁcally:

Do not connect a signal to the TRIGGER DIRECT or TRIGGER PRESCALE front-panel connector unless you have selected that input as the trigger source in the Trigger setup dialog box.

Do not connect a signal to the External 10 MHz R eference front-panel connector unless you have selected that input as the timebase mode in the Horizontal setup dialog box.

38 DSA8200 Quick Start User Manual

Triggers

Gated Trigger Connector (Option GT Equipped)

You can attach a BNC cable to the External Gate input at the rear panel (TTL connection) to selectively exclude data from acquisition by means of gating the trigger on and off. Several conditions must be met to get a stable display of waveform data:

The channel and trigger must be otherwise triggerable without the trigger gate.

The gating signal must be at a TTL high.

The triggering system must be enabled.

Enhanced Triggering

These featu

Trigger

Trigger holdoff can help stabilize triggering. When you adjust holdoff, the instrument changes the time it waits before rearming its trigger circuit after acquiring a sample. Before rearming, trigger circuitry cannot recognize when the next trigger conditions are satisﬁed and cannot generate the next trigger event. When the instrument is triggering on undesired events, you can adjust holdoff to obtain stable triggering.

res can help stabilize triggering and perform special measurements:

High Frequ

hysteresis (a transition or noise band), which allows triggering on higher frequency signals.

Gated Triggering. Gated triggering takes the trigger and the External Gate input and applies them to the instrument through what is in effect an AND function. Gated triggering can be used for applications such as simulations of undersea communic traveling longer distances. The trigger gate can be used to ignore triggers until the signal has traversed the loop many times.

ency Triggering. High Frequency triggering increases trigger sensitivity of the trigger circuit by decreasing

ation ﬁbers where test ﬁxtures are used to repeat the test signal through a short loop of cable to simulate

Holdoff

DSA8200 Quick Start User Manual 39

Triggers

Setting Trigger Controls

Nearly all trigger parameters are set in the Trigger Setup dialog window.

1. Press the trigger MENU button to display the Trig Setup dialog box.

2. Select a trigger source.

3. Select a trigger mode: Auto or Normal.

4. Select the trigger slope.

5. Select a trigger level. Click Set to 50%

to automatically set the trigger level to 50% of the trigger signal amplitude.

6. Set the trigger holdoff value.

7. Select an Enhanced Triggering setting.

8. If the trigger source is set to Pattern

Sync, select Pattern Sync Setup....This

option is only available with a Pattern Sync module.

Quick Tips

Selecting External Direct as the trigger source requires an appropriate trigger signal be connected to the TRIGGER DIRECT INPUT connector.

The Slope and Level controls apply only w hen the trigger source is set to External Direct.

Selecting External Prescaler as the trigger source requires an appropriate trigger signal be connected to the TRIGGER PRESCALE INPUT connector.

Selecting External Prescaler sets the trigger Mode to Normal.

Selecting Internal Clock uses the clock frequency setting in the pulldown list.

Selecting Clock Recovery requires that a module with clock recovery is available. Select the clock recovery standard from the pulldown lists or user-speciﬁed range controls.

Gated Trigger is only available with Option GT.

Pattern Sync trigger is only available if a PatternSync module is installed.

The trigger output from the PatternSync module must be connected to the TRIGGER DIRECT INPUT connector.

Selecting Pattern Sync as the trigger source presets several trigger controls to predeﬁned settings appropriate for using the external TRIGG E R DIRECT INPUT connector.

40 DSA8200 Quick Start User Manual

Setting Pattern Sync Controls

The Pattern Sync dialog box can be displayed when Pattern Sync is the selected triggering source.

1. Select the parameters for the pattern

sync module.

Select the channel Source where the pattern sync module is installed.

Select the Data Rate (bit rate) (default is 2.48832 Gbps).

Select the Pattern Length (default is

127).

Select a Data:Clock Ratio (data-to-clock ratio) (default is 1:1).

Select a Relative Trigger Bit (in the range of 0 to Pattern Length-1) (default is 0).

Triggers

2. Use the AutoSync feature to

automatically detect the data rate, pattern length and/or data-to-clock ratio of the applied data and clock signals (data to a sampling module channel and the clock to the Pattern Sync module).

3. Enable FrameScan to automatically scan

through a pattern (or part o f a pattern).

The FrameScan control is tied to the FrameScan control in the Horizontal Setup dialog box (changing either one affects the other).

Quick Tips

All pattern sync controls are disabled (grayed out) if there are no available pattern sync sources.

The default selected pattern sync source is the lowest-numbered pattern sync module.

The Data Rate in the Pattern Sync dialog box is tied to the Bit Rate control in the Horizontal setup dialog box (changing either one affects the other).

If the entered Data Rate does not match the rate of the selected communication standard in the Horizontal Setup, then the communication standard is changed to "User".

Using the PatternSync Trigger module in conjunction with FrameScan can improve both acquisition throughput and timing accuracy.

For highest reliability and speed, it’s recommended to manually enter as many control values as possible. The control value must be unchecked in the AutoSync Options to allow manual entry.

DSA8200 Quick Start User Manual 41

Triggers

Checking Trigger Status

You can check the status of the trigger from the front panel and in the status bar. The status bar also displays the waveform count.

You can use a phase reference module (such as the 82A04) for triggering. (See page 60, Phase Reference.)

1. Check the READY and TRIG’D front-panel controls to determine the trigger status.

42 DSA8200 Quick Start User Manual

Analyzing Wavef

orms

Analyzing Wav

Your instrument features cursors, automatic measurements, statistics, histograms, and math to assist you in analyzing waveforms. This section contains concepts and procedures for analyzing waveforms. Detailed information is available in the online help.

eforms

Taking Automatic Measurements

Automated m are further divided into categories: amplitude, time, and area.

1. Use the Vertical buttons to select the

waveform to be measured.

The waveform may be a channel, reference, or math waveform.

2. Select one of the signal (waveform)

types and then select a category from the measurement bar.

3. Click the measurement you want in the

measurement tool bar.

easurements are divided into signal types: Pulse, NRZ (Non-Return-to-Zero), and RZ (Return-to-Zero). These

4. Read the results in the measurements

readout.

DSA8200 Quick Start User Manual 43

Analyzing Wavef

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To see statisti

5. Right click on to display its context menu.

6. Select Show Statistics to display measurement statistics in the measurement

To show annotations:

7. Right click on any measurement readout to display i

8. Select Show annotations that indicate which portion of the waveform is being measured as well as referen

9. Note the po measured.

10. Note the reference levels for the measurement.

cs:

any measurement readout

readout.

ts context menu.

Annotations to display

ce levels for the measurement.

rtion of the waveform being

44 DSA8200 Quick Start User Manual

To measure a waveform database:

11. From the application menu bar, select

Setup, and then select Meas.

In the Meas Set

up dialog box, make sure the measurement (one of Meas 1 through Meas 8) is selected.

12. In the Source tab, check the Use Wfm Database opt

ion.

Analyzing Wavef

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DSA8200 Quick Start User Manual 45

Analyzing Wavef

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To localize a me

13. Select Meas.

14. Select the Reg

15. Click the On bo

display the gates on screen.

16. Use the G1 (Gate1) and G2 spin controls to adjust the gates on screen such that theareatome gates.

17. Click the Annotations box to display which portion of the waveform is being measured a that measurement.

asurement:

ion tab.

x to turn gating on and to

asure is between the

nd the reference levels for

kTips

Quic

If, at the time you ﬁrst create a measurement, the measurement source you select is displayed as a waveform database, the database will automatically be measured. Deselect the User Wfm Database option if you want to measure the vector waveform instead of the database.

Gate values are entered as a percentage of the waveform, displayed from left to right. If no keyboard is installed, access the virtual keyboard and use the touch screen to enter values.

You can select and drag the gates to new locations by using a mouse or the touch screen.

46 DSA8200 Quick Start User Manual

Turning Off Automatic Measurements

Up to eight automatic measurements can be assigned. Once all eight slots are used, no more can be assigned. If you need to take another automatic measurement, and all measurement slots are used, make a slot available for the new measurement or redeﬁne a current measurement slot.

1. Note the assigned measurements. In

this example, measurement slots 1 and 3 have measurements assigned.

2. Select Meas (measurement) from the

Setup dialog box.

3. Use the pulldown list to select Meas 3

(measurement slot 3).

4. Note that measurement slot 3 has a

measureme (On).

nt assigned and is displayed

Analyzing Wavef

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5. Press the Select Meas button to set

measurement slot 3 to None.

6. Note that measurement slot 3 is Not

Deﬁned and no measurement icon is

ayed.

displ

7. Note that measurement slot 1 has a

measurement assigned. It is set to not

lay, but the measurement slot is still

disp used.

ck Tip

Qui

To easily redeﬁne a measurement slot, select Select Meas and choose a new measurement.

DSA8200 Quick Start User Manual 47

Analyzing Wavef

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Cursor Measurements

Use cursors to measure amplitude and time quickly and with more accuracy than when using the graticule to take measurements. Because you position cursors wherever you want on the waveform, they are easier to localize to a waveform segment or feature than automatic measurements.

1. Press the CURSORS button:

Once for Vertical Bars

Twice for Horizontal Bars

Three times for waveform cursors

2. Press the SELECT button to toggle selection between the two cursors. The active cursor is represented by a solid line.

3. Turn the G eneral Purpose knob to position each cursor on the waveform to measure the feature that interests you.

4. Vertical bars (V Bars) measure time (horizontal) parameters.

5. Horizontal bars (H Bars) measure

itude parameters.

ampl

48 DSA8200 Quick Start User Manual

6. Waveform cursors measure vertical and

horizontal parameters simultaneously. Waveform curs waveform and track with the waveform points.

7. Read cursor measurement results on the

display.

ors are attached to the

Analyzing Wavef

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8. Click this

readouts on and off.

Quick T

Cursors require that at least one waveform is selected on the screen.

Waveform cursors are not available if a waveform database is selected.

You can drag a cursor to place it relative to the waveform.

You can assign each cursor to a different waveform to measure differences between waveforms. Make these selections in the C ursor setup dialog box.

button to toggle the cursor

ips

If you use two magniﬁed time base views, you can take precision timing measurements between two distant points on a waveform. Magnify each point of interest in a separate time base, and then place one cursor on each point. The Δ-time cursor readout will then reﬂect the position and resolution of the magniﬁed time bases.

DSA8200 Quick Start User Manual 49

Analyzing Wavef

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Math Waveforms

You create math waveforms by creating a math expression using the Deﬁne Math dialog box. In that dialog box, you apply numerical constants, math operators, and functions to operands, w hich can be channels, waveforms, reference waveforms, measurements (scalars), or ﬁxed scalars. You can display and manipulate these derived math waveforms much like you can the channel and reference waveforms.

1. Press the Vertical MATH button (once or twice if needed) to display the Deﬁne Math dialog box.

2. Click the Math Waveform drop-down list in the dialog box and select one of the eight available math waveforms.

3. Use the dialog box to deﬁneamath expression. Some guidelines for creating your expression follow:

Sources (C1 - C8, R1 - R8, and

Meas 1 - Meas 8) should be set up before you use them (references and automated measurement scalars should be deﬁned).

Elements that appear grayed out

cannot be selected because they would result in an illegal entry.

50 DSA8200 Quick Start User Manual

4. Use the ﬁlter controls in the dialog box

to apply a ﬁlter to the math waveform deﬁned by the e

5. When you have deﬁned the expression,

click Apply.

6. Select the Math Waveform On box, so

that the waveform displays.

xpression.

Analyzing Wavef

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Quick

DSA8200 Quick Start User Manual 51

Tip

If you select a waveform that is already deﬁned, its math expression appears in the dialog box. To use the w aveform, click the Clear button, which discards its previous math expression.

Analyzing Wavef

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Waveform Databases

The four available waveform databases can be used for measurements, histogram calculations, mask testing, and generating a density-style, graded display. Waveform databases may be automatically allocated for measurements, histograms, and mask testing.

1. Click Wfm Database in the Setup dialog box.

2. From the pulldown menu under Database, select one of the four available databases.

3. Click the Source button to select the waveform source.

4. Click On to start accumulating data from the selected source.

5. Click Display to turn on the display of the waveform database.

6. Select the Persistence mode for the selected waveform.

7. If you selected Variable persistence, you can specify the number of waveforms that are included in the waveform database.

The following Display Options affect all waveform databases that you display:

8. Click a grading display option.

9. Click Invert to emphasize the least

occurring pixels by reversing the intensity/color assignments to each grading partition.

10. Select one of the four grading methods.

11. If you selected one of the two

Emphasized grading methods, slide the Emphasize Counts percentage control to specify the range of counts you want emphasized.

Quick Tip

tain measurements require the use of a waveform database and automatically set the measurement system to use a

Cer waveform database if available.

52 DSA8200 Quick Start User Manual

Display a Communication Signal

Analyzing Wavef

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1. Carefully ins

the instrument. (See page 6, Instal ling Modules.) Also, read the user manual for your speciﬁcm

2. Connect sign

module.

CAUTION. Always observe static-safe

procedures your sampling-module user manual when connecting signals.

3. Select the channel that you want to

display i

4. Select th

5. Click Au

box or on the front panel.

tall the sampling module in

odule.

als to your sampling

and cautions as outlined in

ntheMasksetupdialogbox.

e communication standard.

toset in the Mask setup dialog

DSA8200 Quick Start User Manual 53

Analyzing Wavef

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Display and Analyze Communication Signals Using Mask Testing

Use mask testing to test your waveforms for time or amplitude violations against a predeﬁned industry standard or a user-deﬁned mask. Mask testing counts waveform samples (called hits or violations) that occur within a speciﬁcarea(the mask). Use the communications-standard masks that this instrument provides (SONET/SDH, Fiber Channel Optical and Electrical, and Ethernet) to test your signals, or deﬁne your own masks.

1. Select the waveform to be mask tested from the drop-down list under Source.

2. Select a standard mask in the Mask setup dialog box. S electing a communication standard or user-deﬁned mask automatically:

Displays the mask on screen and

autosets for the mask if Automatic is checked in the dialog box.

Enables mask testing.

Displays mask count statistics in the

mask readout. A mask does not have to be displayed to have mask counting enabled.

3. If you want, disable mask counts. (Selecting a mask in step 2 automatically enabled them.)

4. Check Use Wfm Database to use a waveform database as the waveform source.

5. You can enable margins to explore design margins of your communications signal.

54 DSA8200 Quick Start User Manual

To autoset the waveform to mask:

6. Click the Autoset button to perform a

manual autoset on the mask-source waveform.

Analyzing Wavef

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7. Select the Hi

determine the High and Low values when aligning the input signal to the masks.

Mean sets the mean value of the High level (topline) and Low level (baseline), taken within the ﬁxed eye eye), to align the input signal to the NRZ mask.

Mode sets t the High level (topline) and Low level (baseline), taken across one unit interval of the eye d signal to the NRZ mask.

To set a Stop Action:

8. Click Acq in the Setup menu.

9. In the A

Condition option under Stop After.

10. In the Condition pulldown list, select

a mask-related c riteria, such as Mask Total

the count box.

These settings stop acquisition when mask v set.

Low Method used to

Mask Autoset to use the

aperture (center 20% of the

he Mask Autoset to use

iagram, to align the input

cq Setup dialog box, check the

Hits and set a count, such as 1, in

iolations satisfy the criteria you

11. Push the RUN/STOP button to restart

uisition, if stopped.

acq

DSA8200 Quick Start User Manual 55

Analyzing Wavef

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To restart test

12. To restart a ft occurs, push the front-panel CLEAR

DATA button.

13. Read the mask-hits count in the readout.

ing:

er a S top After condition

Quick Tips

ing a source that is currently displayed as a waveform database automatically enables mask testing on the

Select database. To mask test the waveform instead of its database, deselect the Use Wfm Database box.

You can choose to autoset the mask-source waveform to the mask each time you select a new mask standard by checking Automatic under Autoset.

Pressing the RUN/STOP button after acquisition has stopped due to a Stop After condition being met causes the

ument to acquire one (and only one) additional waveform.

instr

lear D ata button resets all mask counts. In addition, if the source for mask testing is a waveform database, clicking

The C this button clears the waveform database.

56 DSA8200 Quick Start User Manual

FrameScan

Use FrameScan to test a speciﬁc bit (or range of bits) in a repeating frame of data. FrameScan acquisitions allow detailed display and analysis of individual, complete waveforms or of the bit sequences leading up to a failure. This ability to identify the speciﬁc patterns that caused the failure makes the FrameScan mode superior to traditional methods.

1. Select the Horizontal Setup menu.

2. Click Enabled in FrameScan.

3. Click Auto Position.

4. Set the Start Bit to specify the starting bit

location for the scan when FrameScan Auto Position mode is on.

5. Set the Scan Bits to the number of bits

or subframes you want to acquire.

Analyzing Wavef

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Quick Tips

The Start Bit control determines the starting horizontal position that FrameScan uses for each acquisition scanning cycle. The Auto Position control must be on to use the Start Bit.

DSA8200 Quick Start User Manual 57

Analyzing Wavef

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The Auto Position control is disabled when the Trigger Source is set to Pattern Sync. When using Pattern Sync, use the Relative Trigg

To Use TDR

To take TDR measurements, you must have a TDR-capable sampling module installed and your network must be attached to the TDR sampling module.

1. Select TDR from the Setup menu.

2. Click the channel button to automatically

display the incident and reﬂected s teps by automating the following tasks:

Turns on the channel.

Turns on a step.

Sets trigger source to Internal Clock.

Sets acquisition to Averaging.

Changes display style to Show

Vectors.

er Bit control in the Pattern Sync conﬁguration settings.

3. Select a channel pair to perform a differential TDR measurement. Press Diff to automatically set up the differential measurement for the channel pair.

All the tasks listed in step 2 are performed for both channels and the pulse polarity of the second channel is set to negative.

4. Click the polarity button to toggle the step edge.

5. Set the vertical scale Units to V (volts), Ω (ohms), or ρ (rho).

6. If performing differential TDR, select the channel (TDR module with dual channel adjustment) or the even-numbered channel of the channel pair (TDR module with single channel adjustment) for deskew adjustment.

7. Set the Deskew percent value.

58 DSA8200 Quick Start User Manual

Analyzing Wavef

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8. Press TDR Autos

display the Autoset Properties dialog box to prepare the TDR autoset.

et Properties to

Quick Tips

Use a lower internal clock rate to examine long cables.

For a TDR module with single channel deskew capability, only the even-numbered channel of the module is selectable for deskew. For a TDR module with dual channel deskew capability, both channels of the module are selectable for deskew. (See page 72, Skew and Deskewing.)

DSA8200 Quick Start User Manual 59

Analyzing Wavef

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Phase Reference

Use the Phase Reference module, and the phase-correction timebase that it supports, when you need to acquire with ultra low jitter. Using this mode reduces trigger jitter in the instrument which lets you measure clock and other phase jitter vulnerable signals with more ﬁdelity.

To use phase reference, you must have a Phase Reference module (such as the 82A04) and a phase reference clock signal synchronous to the data to be acquired connected to the Phase Reference module. Refer to the online help for more information on using the Phase Reference timebase.

1. Click Phase Ref in the Setup menu to display the Phase Reference dialog box.

2. Turn Phase C orrection on by checking either Free Run or Triggered.

Free Run: A trigger is automatically

generated. Multi-clock-cycle-period displayed signals are synchronous with the phase reference but overlaid.

Triggered: Samples are corrected

for horizontal position per the phase reference supplied, but otherwise have all the attributes of a triggered waveform.

Triggered (SSC): Phase correction

is active and the trigger is used to determine the horizontal acquisition window. The instrument assumes some amount of Spread Spectrum Clocking contained on the phase reference input clock.

3. Click the Source control to select the module to which you connected the clock (if more than one phase reference module is installed).

4. Select the input frequency to the phase reference module.

Use the Input Freq control to enter the

frequency of Phase Reference clock or use the Standard Freq Table button to select a communications standard.

60 DSA8200 Quick Start User Manual

5. Press the Characterize button to

characterize the clock signal attached to the phase refe

Quick Tips

When entering the phase reference clock frequency, the value must be within 1% of the actual frequency.

The instrument accommodates up to approximately 5000 ppm of SSC.

Histograms

rence module.

Analyzing Wavef

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The instru horizontal (time or distance) histograms, but only one at a time.

1. Display the Hist (Histogram) dialog box.

2. Check the Enable Histogram box.

3. Click the Source button to select the

4. Select a

ment can display histograms constructed of waveform data. You can display both vertical (amplitude) and

m source.

wavefor

vertical or horizontal histogram.

DSA8200 Quick Start User Manual 61

Analyzing Wavef

5. Click and drag the edges of the histogram box to enclose a portion of the waveform.

6. The histogram displays at the edge of the graticule are displayed in the readout.

orms

. The histogram statistics

62 DSA8200 Quick Start User Manual

Document Your Results

This instrument can save any number of waveforms, limited only by the space you have to store them. By saving a waveform, you can recall it at a later time for comparison, evaluation, and documentation. This capability is helpful when you want to:

Recall a waveform for further evaluation or comparison with other waveforms.

Extend the waveform-carrying capacity of the instrument. The instrument supports eight reference, eight channel, and eight math waveforms. If you want more than eight reference waveforms, you can save the additional reference waveformstodiskforrecalllater.

1. To Save a setup or a waveform, click

Save Setup or Save Waveform in the

File menu.

2. To export waveform data, click Export

Waveform in the File menu.

Analyzing Wavef

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3. To print a hard copy to an attached

r or a network printer, click the print

printe icon in the toolbar.

4. To copy a screen image into another

application, choose the Print to ﬁle option in the print dialog box. Save the screen image in a format that is compatible with your application, and then insert the screen image into your document.

DSA8200 Quick Start User Manual 63

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64 DSA8200 Quick Start User Manual

Using the 80A05 E

lectrical Clock Recovery Module Examples

Using the 80A0

This section contains various ways to use an 80A05 Electrical Clock Recovery module with other optical and electrical sampling modules.

The 80A05 brings ease of use to sampling oscilloscopes by offering simple triggering on both single-ended and differential electrical signals through its clock recovery. The differential functionality, in particular, simpliﬁes acquisitions that are otherwise difﬁcult to accomplish. The 80A05 can recover clock signals at most standard rates between 50 Mb/s and 12.6 Gb/s.

The skew between signals p resents a challenge to many measurements. Verifying the amount of skew and deskewing when necessary keeps your skew errors in check and limits the undesirable inﬂuence of common-mode signals on your measurements.

This section presents example setups and information about vertical calibration, horizontal deskew, and minimizing the effects of skew on your measurements. Each example includes an illustration of the setup.

Figure 1: 80A05 module

5 E lectrical Clock Recovery Module Examples

DSA8200 Quick Start User Manual 65

Using the 80A05 E

lectrical Clock Recovery Module Examples

Clock Recovery / Trigger on Recovered Clock

In this example, the signal is connected to the 80A05 module. The mainframe is set to trigger when the module delivers a recovered clock signal. The connections for acquired signal(s) are not shown in the illustration.

1. Set your mainframe trigger source to Clock Recovery for the channel that the 80A05 occupies.

2. Attach the input signal cables to the 80A05 module inputs and terminate the signal outputs in 50 Ω.

3. The 80A05 can then deliver a recovered clock signal to the mainframe to be used for triggering.

NOTE. This differential setup may require

deskewing before measuring signals from your device under test (DUT). (See page 72, Skew and Deskewing.)

66 DSA8200 Quick Start User Manual

Using the 80A05 E

lectrical Clock Recovery Module Examples

Clock Recovery / Trigger for Optical Signal, with the 80C12 Optical Module

In this example, the 80A05 delivers the recovered clock signal from the 80C12 to the mainframe to be used for triggering.

1. Set your mainframe trigger source to

Clock Recovery for the channel the 80A05 occupies.

2. Connect the ELECTRICAL SIGNAL

OUT from the 80C12 module to the ELECTRICAL SIGNAL IN of the 80A05 using an electrical signal cable.

3. Attach the optical input signal cable to the

80C12 and terminate the 80A05 signal outputs in 50 Ω.

The 80A05 will deliver the recovered clock signal from the 80C12 to the mainframe.

DSA8200 Quick Start User Manual 67

Using the 80A05 E

lectrical Clock Recovery Module Examples

Differential Clock Recovery and Acquisition

In this example, the electrical output signals of the 80A05 module are connected to an electrical sampling m odule(s), s uch as an 80E03, with a matched set of differential cables.

1. Connect the 80A05 outputs to the 80E03 inputs using a matched set of coaxial cables.

2. Connect the output of the DUT to the 80A05 inputs using another set of matched coaxial cables.

This differential setup may require deskewing before measuring signals from your device under test (DUT). (See page 72, Skew and Deskewing.)

68 DSA8200 Quick Start User Manual

Probing with Low-Impedance Probes

Low-impedance probes (also called Z0 probes or controlled-impedance probes) are passive probes that have very low input capacitance and low input resistance. These probes are a useful choice for some applications. However, because the input resistance on these probes is low, they can cause measurement errors.

Passive probes, such as the P6150 Probe (with 10X probe tip) and the P8018 Handheld TDR Probe, when used with good quality cables, can typically probe systems approaching 20 GHz. In particular, the bandwidth of the P6150 Probe is greatly improved by using a very short, high speed cable.

When debugging or characterizing a functioning circuit, a controlled-impedance probe will drain current from the DUT. When the in-circuit source impedance is not small compared to the probe impedance (typically 500 Ω for 10X), this current can be appreciable and impact important parameters such as bias point, offset voltage, noise margin, signal amplitude, and switching point. In this case, the probe introduces errors in the measurements it is being used to take. T he probe can change circuit behavior or even cause the circuit to stop working.

When using differential probes, you should use a matched set of coaxial cables.

Using the 80A05 E

lectrical Clock Recovery Module Examples

Figure 2: P6150 Probe

DSA8200 Quick Start User Manual 69

Using the 80A05 E

lectrical Clock Recovery Module Examples

Probing with Differential to Single-Ended Probes

The popular P7380 series TekConnect probes can be used with 80A03 TekConnect adaptor. The P7380 offers two outputs: one on the TekConnect connector, and another on an SMA on the probe body. If the signal captured by the probe is to be used for both clock recovery and acquisition, we recommend using the signal from the SMA on the probe body for the clock recovery task. Connect the probe body SMA to the 80A05 input. The acquisition path u ses the TekConnect signal.

Figure 3: Differential to single-ended probes setup example

70 DSA8200 Quick Start User Manual

Vertical Gain Adjustment

If the signal is passing through the Input of the 80A05 module, it might be necessary to adjust the signal for accurate Vertical Scale. The built-in calibration voltage attribute of the DSA8200 mainframe makes this a simple procedure. After connecting your signal source or sources, do the following steps. If you have a differential setup, repeat these steps for both inputs.

1. Select the Setup > Vert menu.

2. Set DC Cal voltage to an appropriate

value.

3. Use the External Attenuation window to

adjust the value to achieve the p roper voltage reading (as measured with a Pulse Mean Measurement).

Using the 80A05 E

lectrical Clock Recovery Module Examples

NOTE. Th

NOTE. T

the P6150 and the P6380 probes can be calibrated using this DC CAL voltage.

e output impedance of the DC CALIBRATION OUTPUT is close to 0 Ω .

his procedure applies equally well if a probe is connected to the input of the 80A05 module. For example, both

DSA8200 Quick Start User Manual 71

Skew and Deskewi

Skew and Deske

The propagation delay inherent in connecting cables and probes can result in inaccurate amplitude and time-correlated measurements. This is caused by the difference between two or more delays, known as skew. S kew can be present in multi-channel applications, and is of particular concern in differential systems. To obtain the best measurement and analysis results from your instrument, you will need to remove skew, a process known as deskewing.

In differential (non-TDR) applications, skew can occur in acquired signals as they propagate from their source to the mainframe. In TDR applications, skew can occur in signals that propagate from the instrument to the device or system under test (DUT), speciﬁcally the TDR stimulus pulses, as well as from acquired signals.

The following procedures and examples explain how to minimize and measure skew in no

wing

Quick Tips

Minimize skew by using balanced cable pairs.

Measure and match your cables. TDR modules such as 80E10, 80E08, and 80E04 allow you to measure cable delays with very high precision.

In differential systems, use differential probes or differential SMA to single-ended active convertors, such as the Tektronix P7380SMA.

Methods to Adjust Skew

n-TDR and TDR systems.

Using a Phase Adjuster

Skew can be adjusted with the use of a variable delay line (phase adjuster). Tektronix part number 015-0708-00 is a phase adjuster with a 25 ps range and VSWR of 1.3:1 at 18 GHz. The advantage of a phase adjuster is that it is functionally invisible. The disadvantage is that signal ﬁdelity is slightly impacted.

Channel Deskew and Channel Delay

To ensure that random, differential, or common-mode signals can be properly time aligned, the DSA8200 allows the skew to be adjusted between individual modules by way of independent acquisition timebases (not available in phase reference mode). This is referred to as channel deskew. In addition, some modules (the 80E06, 80E07, 80E08, 80E09, and 80E10) contain an additional, and highly useful, skew adjustment capability called channel delay.

While both deskew and delay allow you the instrument, they are implemented differently. Deskew is applied to the strobe drive of the module that is common to both channels in the module. When the deskew values differ between the channels, the instrument automatically performs separate acquisitions for each cha Delay is applied only to an individual channel in the module. Therefore, to retain maximum performance, keep the deskew values for both channels in a single sampling module the same and use the delay control if possible.

to compensate individual channels for skew differences introduced externally from

nnel (on different sets of triggers) in order to satisfy the requested deskew difference.

72 DSA8200 Quick Start User Manual

Skew and Deskewi

Channel deskew can be used for repetitive signals. Data is captured with the timebase skew adjusted for each channel, one at a time. This m of your sampling oscilloscope. If, for each trigger, there is always the same signal, the oscilloscope can adjust the skew using channel deskew. The number of triggers needed to ﬁll the trace doubles relative to an undeskewed acquisition system. More optimal perfo

ethod of skew adjustment relies on the fact that your signals are completely repetitive relative to the trigger

rmance can be obtained using multiple modules or modules with channel delay capability.

Random signal The oscilloscope must acquire each waveform sample of both differential branches from exactly the same trigger event. Otherwise, due to the random nature of the signal, one of the sam ples of the differential pair may have changed value (from an absolute,

s are signals that do not necessarily repeat on equivalent trigger events from acquisition to acquisition.

real-time perspective) and will yield incorrect results of the mathematical differential or common mode waveform.

Setup Considerations and Procedures

Before starting, there are two setup choices to be made. These are explained in the following sections.

Reference Plane

This is the location at which you ultimately want both the acquisition signals and TDR steps (if you are using TDR) to be time aligned. (See Figure 4 on page 74.) Common choices for the reference plane include:

The instrument front panel

The inputs to a DUT (Device Under Test) attached to cables

The inputs to a DUT within a ﬁxture

For best results, select the reference plane at the DUT interface. If it is not possible to inject the signal source at the

reference plane, ensure that the signal paths for each of the differential signals are precisely m atched between

desired the DUT and the selected reference plane.

If you are using the 80A05 Clock Recovery Module and routing your differential signals through this module to an acquisition module, you must leave the 80A05 connected during the deskew procedure. This will ensure that any skew introduced by the 80A05 o

r the connecting cables will be accounted for by the deskew procedure.

DSA8200 Quick Start User Manual 73

Skew and Deskewi

Figure 4: Schematic diagram of reference planes in relation to signal

Acquisition Deskew Signal Sources

There are three possible signals that may be used as a source to be connected to, or "injected" into, the reference plane.

A TDR step from an extra (unused) TDR-capable module channel (recommended source)

A stable, fast-edge, low-repetition rate signal that is synchronous to an external trigger source

The Internal Clock Output (from the instrument front panel)

The TDR step source is preferred because it provides a fast, stable edge at a low repetition rate that is ideal for deskewing signal paths. The low repetition rate signal should have a repetition rate much lower than the amount of skew that needs to be removed so that the relative skew between signals can be correctly determined.

Following are three procedures to set up your instrument in preparation for performing an Acquisition Deskew. Choose the procedure related to the signal source you are using.

74 DSA8200 Quick Start User Manual

TDR Step Source

1. Display the TDR setup dialog box by

selecting TDR

from the Setup menu.

Skew and Deskewi

2. Turn on the ste

button for the source channel. This will turn on the step and set other scope parameters ( preparation for making measurements.

NOTE. Use only the rising edge polarity.

Autoset in th negative-going edge.

3. Turn off the display of the channel by

uncheckin source channel. This channel does not need to be displayed.

4. Connect a cable or TDR probe to the

source ch TDR step signal into the reference plane.

p by clicking the Preset

such as trigger source) in

is mode will not ﬁnd a

g the ACQ On box for the

annel to use for injecting the

DSA8200 Quick Start User Manual 75

Skew and Deskewi

External Signal

1. Set the trigge or External Prescaler as appropriate for the bandwidth of the trigger signal.

2. Connect the trigger signal to the appropri (TRIGGER DIRECT INPUT or TRIGGER PRESCALE INPUT).

3. Connect a cable or TDR probe to the low-repeti synchronous with the trigger signal to use for injecting the signal into the reference p

r source to External Direct

ate mainframe input

tion source signal that is

lane.

76 DSA8200 Quick Start User Manual

Internal Clock Output

Skew and Deskewi

1. Set the trigge

2. Connect a cabl

INTERNAL CLOCK OUTPUT connector on the front panel of the m ainframe to use for injec reference plane.

NOTE. It might be necessary to use a 50 Ω

terminated S divider, or a 2 – 6 dB attenuator to reduce the Internal Clock Output amplitude to an acceptable

r source to Internal Clock.

e or TDR probe to the

ting the clock signal into the

MA T, a 50 Ω terminated power

amplitude for the module.

For ﬁxture or DUT locations that do not support a cable attachment, the acquisition deskew signal can be injected by a P8018 si

ngle-ended TDR probe.

DSA8200 Quick Start User Manual 77

Skew and Deskewi

Acquisition Deskew Procedure

The following procedure outlines a method to deskew a single differential (or common) mode system (one signal pair). The procedure can be extended to additional signal pairs as needed. This method time aligns the acquisition system such that the data i s acquired simultaneously at the selected reference plane. The procedure accounts for delay mismatches between the differential signal lines from the reference plane to the a cquisition inputs.

In this procedure, we will use Ch5 as the + channel and Ch6 as the – channel.

1. Using the previous discussions on deskew signal types and reference planes, inject your selected source signal at the selected reference plane for the + channel. Turn Ch5 on.

2. From the Utilities menu, select Autoset Properties to display the Autoset Properties dialog box. Choose Edge Mode then click the Autoset button to autoset the signal. Click Close to close the dialog box.

3. Turn on acquisition averaging by clicking on the Acq Mode drop down control and choose Average.

4. Click the Deﬁne Math button on the tool bar or press the Math button on the front panel to display the Deﬁne Math dialog box.

5. Create the following math expression using the buttons in the dialog: Filter(C5). Set the Filter Risetime to a value that is less than half the risetime of the source signal. Check the On box to display the math waveform then close the dialog.

NOTE. At this point, you can dismiss the

Ch5 display by pressing the CH button on the front panel and then press the 5 button.

78 DSA8200 Quick Start User Manual

6. Display the Save Waveform(s) dialog box

by choosing Save Waveform from the File menu. Sav the Save button. Click C lose to dismiss the dialog box. R1 will automatically be displayed.

eM1intoR1byclicking

Skew and Deskewi

7. Connect y our

the – channel.

8. Display t

modifythemathexpressiontousethe – channel: Filter(C6). You can use the Backspa Click OK to apply the changes and dismiss the dialog box.

selected signal source to

he Deﬁne Math dialog box and

ce button to edit the expression.

9. From the Utilities menu, select Autoset

Properties to display the Autoset Properties dialog box (see step 2 ). Choose Edge Mode then click the Autoset button to autoset the signal. Click Close to close the dialog box.

DSA8200 Quick Start User Manual 79

Skew and Deskewi

10. Display the Measurement Setup dialog box by choosing Measurement from the Setup menu.

11. Click the Sele the Delay measurement from the Pulse

- Timing list. Set Source 1 to R 1 and Source2toM1

12. Using the pre Methods to Adjust Skew, adjust the skew by changing the Delay or Deskew value for C6 or by c adjustor until the measurement reads near zero.

ct Meas button and choose

vious discussion on

hanging the external phase

80 DSA8200 Quick Start User Manual

TDR Step Deskew Procedure

TDR Step Deskew time aligns the T DR steps such that the stimulus steps arrive at the selected reference plane at precisely the same time. This procedure requires that an Acquisition Deskew be performed ﬁrst so that the acquisition channels are properly aligned. It is important that the same reference plane be used for both the Acquisition Deskew and the TDR Step Deskew procedures to avoid possible misalignment of the signals.

1. Ensure that either an open or a short is

present at the reference plane for the TDR channels to be deskewed. For best results, both channels should have the same termination.

NOTE. Before proceeding, be sure to set

the polarity of the TDR steps to match the step polarities of your application if they are different than the defaults used here (for example, if you are using a common mode measurement).

2. Display the TDR Setup dialog box by

choosing TDR from the Setup menu. Click the differential preset button for the channels you will be using. The TDR preset sets the odd channel to a positive step and the even channel to a negative step. In this procedure, we will use Ch5 and Ch6 as the positive and negative channels.

Skew and Deskewi

3. Change the units for both channels to V

(Volts) then dismiss the dialog box.

DSA8200 Quick Start User Manual 81

Skew and Deskewi

4. Choose Autoset Properties from the Utilities dialog box to display the Autoset Properties di Mode and clear the Display Incident Edge check box.

5. Perform an autoset by clicking the Autoset butt dismiss the dialog box.

a. Given reasonably matched paths to the DUT, bot be displayed near the 3rd horizontal graticule. If not, increase the Horizontal Scale unti displayed on the screen.

b. Adjust Horizontal Scale ( and Position, if necessa edges are visible and apart from each other in order to obtain good horizontal resoluti scale is a typical target.

alog box. Choose TDR

on in the dialog box then

hreﬂected edges should

l both reﬂected edges are

ry), such that the two reﬂected

on. A 10 to 1000 ps/div horizontal

6. Click the Deﬁne Math button on the tool bar or press the Math button on the front panel to box.

7. Create the following math expression using the buttons in the dialog box: Filter value that is less than half the risetime of the reﬂected TDR step. Check the On box to

display the Deﬁne Math dialog

(C5). Set the Filter Risetime to a

display the math waveform.

82 DSA8200 Quick Start User Manual

Tektronix DSA8200 Primary User

Specifications and Main Features

Frequently Asked Questions

User Manual